...What kind of lies? Matthew Yglesias makes the case that Bush is engaged in a particular form of lies in order to appear, well, liberal:
You don't hear Reagan-style ideological anti-statist stuff from Bush very much. There's no "the government is the problem" or "get the government off our backs." His tax cuts are sold explicitly on the (dubious) theory that they don't starve the government of revenue needed to finance the social insurance state. Bush's Social Security rhetoric is designed to deny that he wants to dismantle the program. He takes for granted the idea that there ought to be a federal program to ensure secure retirements for all Americans. The "compassionate conservative" agenda presupposes that a robust federal effort to combat poverty is a good and worthy idea.
Now I and Matt both think that this is lie. Bush is trying to do in Social Security. But it is important to pretend that it is all about "preserving" SS. Except for welfare, which has been dealt with, liberal social programs are very popular. They have to be done in by sneak attack. Thus Bush speaks left and governs right.